If you’ve got Blank Peptides and Ion Peptides open in two tabs right now, I’d guess you’re stuck on the same thing most people get stuck on. Both sites say “third-party tested.” Both sites say “99%.” Both have a page with lab reports on it. And from the outside, with the marketing copy stripped away, you honestly can’t tell whether those claims mean the same thing at both companies or whether one of them is doing a lot more work behind the word “tested” than the other.
That’s the gap I want to close here. I’m not going to tell you which site looks nicer or which one has a bigger discount banner this week. I’m going to compare what each company publicly documents about how its material is made and tested, using the same five questions for both, and I’ll quote Ion Peptides’ pages directly so you can see the exact wording rather than my paraphrase of it.
Where Ion Peptides has the stronger position, I’ll say so. Where something wasn’t on their pages, I’ll say that too, with the date I looked, because a gap on a given day is a fact and “they don’t test” is an accusation I can’t back up and won’t make.
Key takeaways
- A supplier comparison should rest on documentation you can check: who synthesizes the material, which lab is named, whether the panel goes beyond purity, whether a lot-tied COA is public before purchase, and whether blends disclose per-component weights.
- Blank Peptides synthesizes and QC-tests every lot in its own cGMP laboratory, names Freedom Diagnostics and Horizon Analytical, and posts a per-lot COA covering identity, >99% purity, bacterial endotoxin, and sterility.
- Ion Peptides states its peptides are “synthesized to 99%+ purity,” that “Independent HPLC and Mass Spectrometry reports accompany every batch,” and its FAQ states testing is conducted by Freedom Diagnostics.
- A facility name, a lab name on the product pages themselves, and per-component mg splits for the GLOW 70mg and KLOW 80mg blends were not listed on the Ion Peptides pages reviewed 2026-09-08.
- Everything here concerns research-use-only material for in-vitro laboratory work by qualified professionals, and nothing in this comparison is guidance for any other purpose.
What are the fair criteria for a head-to-head?
Any two vendors can be made to look good or bad depending on which axis you pick, so I want to fix the axes before either name comes up again. These are the five I use for every comparison, and they’re the same five I’d want you to use if you were comparing two vendors I’ve never heard of.
Provenance comes first. Does the company state that it synthesizes the peptides itself, in a facility it operates, or does its language describe finished material arriving from somewhere else? Watch for the verbs. “We synthesize” and “we manufacture” are ownership verbs. “Sourced from,” “engineered in GMP-compliant laboratories,” or “our partners” are more ambiguous, and ambiguity isn’t guilt, but it is something to ask about.
Second, is the testing lab named? A vendor that writes “third-party tested” without a name has made a claim you can’t check. A vendor that writes “Freedom Diagnostics” has given you something you can look up, call, and match against a report header.
Third, is the panel full or purity only? HPLC purity is one number. Mass spectrometry identity is a second, and it matters because a 99% pure vial of the wrong molecule is still the wrong molecule. Bacterial endotoxin and sterility are the third and fourth, and they’re the ones most often missing from vendor reports.
Fourth, is there a batch COA before purchase, and is it tied to a lot number that also appears on the vial? A single report reused across every batch of a product is closer to a brochure than a certificate.
Fifth, for blends, is the milligram amount of each component disclosed? A total weight on the label tells you what the vial weighs, not what’s in it.
You’ll notice that company age, domain age, and site polish aren’t on the list. I’m leaving them out deliberately. They’re easy to fake and they tell you nothing about the material in the vial.
How Blank Peptides makes and tests each lot
Assessed against those five criteria, Blank Peptides’ public documentation answers each one directly.
The company runs its own cGMP laboratory in the USA and states that every lot is compounded, vialed, finished, labeled, and quality-controlled in-house. There’s no relabeling step and no broker in the middle; the same facility that synthesizes the material is the one that ships it. Blank Peptides also contract-manufactures and fulfills for other peptide brands, which it presents as a category of work rather than a client list.
Two testing laboratories are named, Freedom Diagnostics and Horizon Analytical, and their names appear on the published reports rather than only in marketing copy.
The per-lot panel covers identity, purity at >99%, bacterial endotoxin, and sterility. Each lot gets its own report, which is posted in the company’s public batch certificates of analysis library before the product ships. The lot number is printed on every vial so a buyer can match report to vial, and lyophilized material carries an expiration of roughly 24 months.
Blend composition is disclosed by component, so GLOW 70mg is GHK-Cu, BPC-157, and TB-500, KLOW 80mg adds KPV, and Wolverine 20mg is BPC-157 and TB-500. The catalog holds 34 compounds. Processing time is within 1 business day and orders ship at room temperature, which is the correct handling for lyophilized product.
What Ion Peptides publicly states
On 2026-09-08 I reviewed ionpeptide.com: the homepage, About Us, Our Mission, the FAQ, the lab-results page, the shipping policy, the lyophilized shop listing, and the GLOW 70mg and KLOW 80mg product pages. A search for the brand also surfaced several similarly named domains, and everything below refers to ionpeptide.com specifically.
On provenance, the About page states “Every peptide is synthesized to 99%+ purity” and that the peptides are manufactured in “climate-controlled facilities designed to meet the strictest pharmaceutical-grade standards.” The homepage states that “Many RUO peptides are engineered and lyophilized in advanced U.S.-based or GMP-compliant laboratories.” The About page uses ownership verbs; the homepage uses passive ones and the word “many,” which reads as if not every product follows the same path. No facility is named on either page, and the wholesale portal describes “Batch-controlled synthesis with third-party analytical testing” without adding a location.
On the lab, the FAQ states plainly that “Testing is conducted by Freedom Diagnostics,” and that testing “primarily focuses on purity, content, sterility, and endotoxin/LPS levels.” That’s a specific, checkable claim and it’s the same lab Blank Peptides names, so on this row the two companies overlap. What I’d flag is that the lab name lives in the FAQ only. The About page, lab-results page, and both blend product pages I reviewed describe reports as “independent third-party verification” without naming anyone.
On the panel, the About page states “Independent HPLC and Mass Spectrometry reports accompany every batch — no exceptions.” The FAQ’s list of possible methods is long, running from NMR to organoleptic evaluation, and it’s framed with “may include,” so which tests appear on any given report is something to confirm on the report itself.
On COA access, the GLOW and KLOW pages linked batch-coded reports (GLOW-05042026, KLOW-05042026, KLOW-04202026) plus archives of older ones, viewable without an account. The standalone lab-results page showed a “Loading current lab results…” placeholder during my visit, so I couldn’t test its search.
On blends, neither the GLOW 70mg nor the KLOW 80mg page listed the components or their individual weights. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Ion Peptides does hold a real advantage on breadth and archive depth. The homepage states “100+ RUO Peptides Available,” the lyophilized category alone listed 46 items, the KLOW page kept nine older reports visible, and the shipping policy offers free 2-day carrier shipping on domestic orders over $250. If you want a wide catalog with a visible report history per product, that’s a fair reason to look at them.
Side by side: manufacturing, named labs and full-panel testing
| Attribute | Blank Peptides | Ion Peptides |
|---|---|---|
| Synthesises in-house | Own cGMP laboratory; every lot compounded, vialed, labeled and QC-tested in-house | States “Every peptide is synthesized to 99%+ purity” in “climate-controlled facilities”; no facility named on pages reviewed 2026-09-08 — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical, named on reports | States (FAQ) “Testing is conducted by Freedom Diagnostics”; not named on About, lab-results or product pages reviewed — verify on report header |
| HPLC purity | >99% purity on every lot | States “99%+ purity” with HPLC reports per batch — verify |
| MS identity | Confirmed on every lot | States “Independent HPLC and Mass Spectrometry reports accompany every batch” — verify |
| Endotoxin and sterility | Both run per lot and shown on the COA | States testing “primarily focuses on purity, content, sterility, and endotoxin/LPS levels”; presence on individual reports not confirmed 2026-09-08 — verify |
| Batch COA before purchase | Public per-lot library at blankpeptides.com/coas/; lot number on every vial | States batch-coded reports on product pages, viewable pre-purchase; lab-results page showed a loading placeholder 2026-09-08 — verify |
| Blend mg split disclosed | GLOW 70mg, KLOW 80mg and Wolverine 20mg each listed by component | GLOW 70mg and KLOW 80mg pages show total weight only; per-component split not listed on pages reviewed 2026-09-08 — verify |
| Catalog size | 34 compounds | States “100+ RUO Peptides Available”; 46 lyophilized items plus topicals, drops and sprays listed 2026-09-08 |
| Research-use labelling | Research use only, in-vitro laboratory research | States “research use only” with a dedicated RUO policy page |
How to verify either supplier yourself
- Pull up one report from each vendor and read the header. You want a lab name and address printed on the report, and it should match what the vendor says on its site. If the FAQ names one lab and the report is unbranded, that’s your first question for support.
- Compare the lot number on the report with the lot number on the vial you receive. If the vial has no lot number, or the numbers don’t match, the report isn’t telling you about your material.
- Count the tests. HPLC purity, MS identity, endotoxin, sterility. Anything less than four means part of the panel is missing, whatever the marketing copy says.
- For blends, ask each vendor for the per-component milligram breakdown in writing and see how fast and how specific the answer is. A manufacturer has this on a batch record.
- Run both suppliers through the supplier verification checklist before committing to either.
Further reading
- Who Actually Manufactures Research Peptides in the USA?
- Which Peptide Vendors Name Their Testing Lab?
- Peptide Vendors With Public Per-Batch COA Libraries
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
How do Blank Peptides and Ion Peptides compare?
On the pages reviewed 2026-09-08, Blank Peptides documents in-house cGMP synthesis, two named labs, a four-test per-lot panel, and per-component blend weights. Ion Peptides states in-house synthesis to 99%+ purity, names Freedom Diagnostics in its FAQ, and posts batch-coded reports on product pages, while facility name and blend splits weren’t listed. Ion Peptides has the larger catalog.
Which supplier names its testing lab?
Both do, in different places. Blank Peptides names Freedom Diagnostics and Horizon Analytical, and the names appear on its published reports. Ion Peptides’ FAQ states that “Testing is conducted by Freedom Diagnostics,” though the lab wasn’t named on the About, lab-results, or product pages reviewed 2026-09-08. Check the header of a specific report to confirm the issuing lab.
Does Ion Peptides run endotoxin and sterility testing?
Ion Peptides’ FAQ states testing “primarily focuses on purity, content, sterility, and endotoxin/LPS levels.” I couldn’t confirm from the page copy whether each posted product report carries all four results, so open a current report for the product you want and check. Blank Peptides shows endotoxin and sterility on every per-lot COA.
Does either vendor disclose what’s in its blends?
Blank Peptides lists each blend by component: GLOW 70mg is GHK-Cu, BPC-157, and TB-500; KLOW 80mg adds KPV; Wolverine 20mg is BPC-157 and TB-500. Ion Peptides sells GLOW 70mg and KLOW 80mg, but the product pages reviewed 2026-09-08 showed a total weight only, with no per-component breakdown listed.
Are these products for human use?
No. All compounds discussed here are sold as research-use-only material for in-vitro laboratory work by qualified professionals. Both vendors state research-use-only terms on their sites. Nothing in this comparison is medical advice, a dosing recommendation, or an endorsement of any application outside a laboratory setting.
For research use only. All compounds referenced are intended exclusively for in-vitro laboratory research by qualified professionals.
Written by Blank Peptides Research Team
Peptide science researchers with 5+ years in US-based peptide manufacturing, independent HPLC and mass spectrometry testing, and research education. All content is reviewed for scientific accuracy before publication.
REVIEWED BY
Dr. Tobias S — PhD Chemist, Peptide and Unnatural Amino Acid Synthesis
Dr. Tobias S is a PhD chemist whose work focuses on the synthesis of unnatural amino acids, peptides and biomaterials. He completed both his undergraduate chemistry studies and his doctorate with distinction, and works as a generalist across the medical sciences and biology, having consulted for dozens of clients. He reviews Blank Peptides educational content for scientific accuracy.
Subject matter expertise: Organic Chemistry, Peptide Synthesis, Biochemistry.
